I could not muster the ability to euthanize and I am so HAPPY I didn't. The hole shows that its healing. Its not bright red anymore and its closing up! He's swimming like nothing happened and eating just fine. My friend gave me some almond leaves so I have been using them and it seems to be helping him heal. So far it looks like Tim Burton is getting better! I am still hoping and keeping his water super clean. Thank you to everyone for your help and kind words. I still have no idea what happened but it does look like he is getting better